object ListDemo {
  def main(args:Array[String]): Unit = {

    val initialActivities = List("Python入门讲座","算法竞赛培训")

    val allActivities = "Scala集合实践":: initialActivities

    println("编程社团活动列表：")
    for (activity <- allActivities){
      println("-" + activity)
    }

    println(s"共${allActivities.size}场活动")
  }
}
